plain bearings
plain bearings
Author :Admin | Publish Date:2013-05-24 10:16:37
Rolling bearings for predominantly radial loads are described as radial
bearings. Most radial bearings can support combined loads, e.g. deep groove ball
bearings, angular contact ball bearings, tapered roller bearings or spherical
roller bearings. Cylindrical roller bearings N, NU, most [plain
bearings] , drawn cup needle roller bearings and needle roller and cage
assemblies can only support radial loads.
Rolling bearings for predominantly axial loads are described as axial
bearings. Axial spherical roller bearings and single direction axial angular
contact ball bearings can support combined axial and radial loads. The other
types of axial bearings are only suitable for axial loads.If there is little
radial space available, bearings with a low
cross-sectional height must be selected, such as needle roller and cage
assemblies; needle roller bearings with or without an inner ring, deep groove
ball bearings and spherical roller bearings of certain series.
If there is little axial space available, bearings series including single
row cylindrical roller bearings, deep groove ball bearings or angular contact
ball bearings are suitable for radial and combined loads. For axial loads, axial
needle roller and cage assemblies, axial needle roller bearings or axial deep
groove ball bearings are used.
A further feature is how the bearings guide a shaft. There are bearings
that allow axial displacements, bearings that guide a shaft in one or both axial
directions and ina bearings that allow angular
adjustment and thus tolerate misalignment of the adjacent construction.
The bearing size is determined primarily by the magnitude and type of load
– dynamic or static – the bearing load carrying capacity and the requirements
for operating life and operational reliability of the bearing arrangement.
Rotating bearings are subjected to dynamic stresses. Bearings are subjected to
static stresses if there is only very slow relative motion between the bearing
rings, if swivel motion occurs or if loads occur in a stationary condition.
Where external dimensions are identical, roller bearings can in general be
subjected to higher loads than ball bearings. As a result, ball bearings are
usually used for small and moderate loads, whilst roller bearings are frequently
used for higher loads and larger shaft diameters.
The function of plain bearing arrangements, like rolling bearing
arrangements, is to support or guide parts that are movable relative to each
other. They must support and transmit the forces occurring in this case. Whereas
the bearing arrangement elements in rolling bearing arrangements are separated
from each other by means of rolling parts - rolling elements - the movable
component in plain bearing arrangements - normally a shaft, stud or strip -
slides on the sliding surface of a static bearing bush, bearing cup or sliding
strip. The sliding motion occurs directly between the sliding layer of the
bearing body and the part that is supported. Lubrication is ensured by embedded
lubricants or a solid layer applied to a supporting body. In radial motion, the
clearance between the shaft and sliding layer ensures the mobility of the
sliding partners.
Plain bearings are available as radial bearings, axial fag bearings, strips, cups and in many other designs. They run
quietly and are particularly suitable where high loads must be supported under
relatively slow rotary and swivel motion and at low and high temperatures. Due
to their versatile specific characteristics, they are therefore used in almost
all areas of industry and especially where the space available for the ntn
bearing arrangement is very limited.
BRING SKF RMS 14 (1 3/4 X 4 1/4 X 1 1/16)
BRING SKF RMS 16 (2 X 4 1/2 X 1 1/16)
BRING SKF RMS 18 (2 1/4 X 5 X 1 1/4)
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